parser.y revision 330449
1%{ 2/*- 3 * parser.y 4 * 5 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 6 * 7 * Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com> 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $Id: parser.y,v 1.5 2003/06/07 21:22:30 max Exp $ 32 * $FreeBSD: stable/11/usr.sbin/bluetooth/hcsecd/parser.y 330449 2018-03-05 07:26:05Z eadler $ 33 */ 34 35#include <sys/fcntl.h> 36#include <sys/queue.h> 37#define L2CAP_SOCKET_CHECKED 38#include <bluetooth.h> 39#include <errno.h> 40#include <limits.h> 41#include <stdio.h> 42#include <stdlib.h> 43#include <stdarg.h> 44#include <string.h> 45#include <syslog.h> 46#include <unistd.h> 47#include "hcsecd.h" 48 49 int yyparse (void); 50 int yylex (void); 51 52static void free_key (link_key_p key); 53static int hexa2int4(char *a); 54static int hexa2int8(char *a); 55 56extern int yylineno; 57static LIST_HEAD(, link_key) link_keys; 58 char *config_file = "/etc/bluetooth/hcsecd.conf"; 59 60static link_key_p key = NULL; 61%} 62 63%union { 64 char *string; 65} 66 67%token <string> T_BDADDRSTRING T_HEXSTRING T_STRING 68%token T_DEVICE T_BDADDR T_NAME T_KEY T_PIN T_NOKEY T_NOPIN T_JUNK 69 70%% 71 72config: line 73 | config line 74 ; 75 76line: T_DEVICE 77 { 78 key = (link_key_p) malloc(sizeof(*key)); 79 if (key == NULL) { 80 syslog(LOG_ERR, "Could not allocate new " \ 81 "config entry"); 82 exit(1); 83 } 84 85 memset(key, 0, sizeof(*key)); 86 } 87 '{' options '}' 88 { 89 if (get_key(&key->bdaddr, 1) != NULL) { 90 syslog(LOG_ERR, "Ignoring duplicated entry " \ 91 "for bdaddr %s", 92 bt_ntoa(&key->bdaddr, NULL)); 93 free_key(key); 94 } else 95 LIST_INSERT_HEAD(&link_keys, key, next); 96 97 key = NULL; 98 } 99 ; 100 101options: option ';' 102 | options option ';' 103 ; 104 105option: bdaddr 106 | name 107 | key 108 | pin 109 ; 110 111bdaddr: T_BDADDR T_BDADDRSTRING 112 { 113 if (!bt_aton($2, &key->bdaddr)) { 114 syslog(LOG_ERR, "Cound not parse BD_ADDR " \ 115 "'%s'", $2); 116 exit(1); 117 } 118 } 119 ; 120 121name: T_NAME T_STRING 122 { 123 if (key->name != NULL) 124 free(key->name); 125 126 key->name = strdup($2); 127 if (key->name == NULL) { 128 syslog(LOG_ERR, "Could not allocate new " \ 129 "device name"); 130 exit(1); 131 } 132 } 133 ; 134 135key: T_KEY T_HEXSTRING 136 { 137 int i, len; 138 139 if (key->key != NULL) 140 free(key->key); 141 142 key->key = (uint8_t *) malloc(NG_HCI_KEY_SIZE); 143 if (key->key == NULL) { 144 syslog(LOG_ERR, "Could not allocate new " \ 145 "link key"); 146 exit(1); 147 } 148 149 memset(key->key, 0, NG_HCI_KEY_SIZE); 150 151 len = strlen($2) / 2; 152 if (len > NG_HCI_KEY_SIZE) 153 len = NG_HCI_KEY_SIZE; 154 155 for (i = 0; i < len; i ++) 156 key->key[i] = hexa2int8((char *)($2) + 2*i); 157 } 158 | T_KEY T_NOKEY 159 { 160 if (key->key != NULL) 161 free(key->key); 162 163 key->key = NULL; 164 } 165 ; 166 167pin: T_PIN T_STRING 168 { 169 if (key->pin != NULL) 170 free(key->pin); 171 172 key->pin = strdup($2); 173 if (key->pin == NULL) { 174 syslog(LOG_ERR, "Could not allocate new " \ 175 "PIN code"); 176 exit(1); 177 } 178 } 179 | T_PIN T_NOPIN 180 { 181 if (key->pin != NULL) 182 free(key->pin); 183 184 key->pin = NULL; 185 } 186 ; 187 188%% 189 190/* Display parser error message */ 191void 192yyerror(char const *message) 193{ 194 syslog(LOG_ERR, "%s in line %d", message, yylineno); 195} 196 197/* Re-read config file */ 198void 199read_config_file(void) 200{ 201 extern FILE *yyin; 202 203 if (config_file == NULL) { 204 syslog(LOG_ERR, "Unknown config file name!"); 205 exit(1); 206 } 207 208 if ((yyin = fopen(config_file, "r")) == NULL) { 209 syslog(LOG_ERR, "Could not open config file '%s'. %s (%d)", 210 config_file, strerror(errno), errno); 211 exit(1); 212 } 213 214 clean_config(); 215 if (yyparse() < 0) { 216 syslog(LOG_ERR, "Could not parse config file '%s'",config_file); 217 exit(1); 218 } 219 220 fclose(yyin); 221 yyin = NULL; 222 223#if __config_debug__ 224 dump_config(); 225#endif 226} 227 228/* Clean config */ 229void 230clean_config(void) 231{ 232 link_key_p key = NULL; 233 234 while ((key = LIST_FIRST(&link_keys)) != NULL) { 235 LIST_REMOVE(key, next); 236 free_key(key); 237 } 238} 239 240/* Find link key entry in the list. Return exact or default match */ 241link_key_p 242get_key(bdaddr_p bdaddr, int exact_match) 243{ 244 link_key_p key = NULL, defkey = NULL; 245 246 LIST_FOREACH(key, &link_keys, next) { 247 if (memcmp(bdaddr, &key->bdaddr, sizeof(key->bdaddr)) == 0) 248 break; 249 250 if (!exact_match) 251 if (memcmp(NG_HCI_BDADDR_ANY, &key->bdaddr, 252 sizeof(key->bdaddr)) == 0) 253 defkey = key; 254 } 255 256 return ((key != NULL)? key : defkey); 257} 258 259#if __config_debug__ 260/* Dump config */ 261void 262dump_config(void) 263{ 264 link_key_p key = NULL; 265 char buffer[64]; 266 267 LIST_FOREACH(key, &link_keys, next) { 268 if (key->key != NULL) 269 snprintf(buffer, sizeof(buffer), 270"0x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", 271 key->key[0], key->key[1], key->key[2], 272 key->key[3], key->key[4], key->key[5], 273 key->key[6], key->key[7], key->key[8], 274 key->key[9], key->key[10], key->key[11], 275 key->key[12], key->key[13], key->key[14], 276 key->key[15]); 277 278 syslog(LOG_DEBUG, 279"device %s " \ 280"bdaddr %s " \ 281"pin %s " \ 282"key %s", 283 (key->name != NULL)? key->name : "noname", 284 bt_ntoa(&key->bdaddr, NULL), 285 (key->pin != NULL)? key->pin : "nopin", 286 (key->key != NULL)? buffer : "nokey"); 287 } 288} 289#endif 290 291/* Read keys file */ 292int 293read_keys_file(void) 294{ 295 FILE *f = NULL; 296 link_key_t *key = NULL; 297 char buf[HCSECD_BUFFER_SIZE], *p = NULL, *cp = NULL; 298 bdaddr_t bdaddr; 299 int i, len; 300 301 if ((f = fopen(HCSECD_KEYSFILE, "r")) == NULL) { 302 if (errno == ENOENT) 303 return (0); 304 305 syslog(LOG_ERR, "Could not open keys file %s. %s (%d)\n", 306 HCSECD_KEYSFILE, strerror(errno), errno); 307 308 return (-1); 309 } 310 311 while ((p = fgets(buf, sizeof(buf), f)) != NULL) { 312 if (*p == '#') 313 continue; 314 if ((cp = strpbrk(p, " ")) == NULL) 315 continue; 316 317 *cp++ = '\0'; 318 319 if (!bt_aton(p, &bdaddr)) 320 continue; 321 322 if ((key = get_key(&bdaddr, 1)) == NULL) 323 continue; 324 325 if (key->key == NULL) { 326 key->key = (uint8_t *) malloc(NG_HCI_KEY_SIZE); 327 if (key->key == NULL) { 328 syslog(LOG_ERR, "Could not allocate link key"); 329 exit(1); 330 } 331 } 332 333 memset(key->key, 0, NG_HCI_KEY_SIZE); 334 335 len = strlen(cp) / 2; 336 if (len > NG_HCI_KEY_SIZE) 337 len = NG_HCI_KEY_SIZE; 338 339 for (i = 0; i < len; i ++) 340 key->key[i] = hexa2int8(cp + 2*i); 341 342 syslog(LOG_DEBUG, "Restored link key for the entry, " \ 343 "remote bdaddr %s, name '%s'", 344 bt_ntoa(&key->bdaddr, NULL), 345 (key->name != NULL)? key->name : "No name"); 346 } 347 348 fclose(f); 349 350 return (0); 351} 352 353/* Dump keys file */ 354int 355dump_keys_file(void) 356{ 357 link_key_p key = NULL; 358 char tmp[PATH_MAX], buf[HCSECD_BUFFER_SIZE]; 359 int f; 360 361 snprintf(tmp, sizeof(tmp), "%s.tmp", HCSECD_KEYSFILE); 362 if ((f = open(tmp, O_RDWR|O_CREAT|O_TRUNC|O_EXCL, 0600)) < 0) { 363 syslog(LOG_ERR, "Could not create temp keys file %s. %s (%d)\n", 364 tmp, strerror(errno), errno); 365 return (-1); 366 } 367 368 LIST_FOREACH(key, &link_keys, next) { 369 if (key->key == NULL) 370 continue; 371 372 snprintf(buf, sizeof(buf), 373"%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n", 374 bt_ntoa(&key->bdaddr, NULL), 375 key->key[0], key->key[1], key->key[2], key->key[3], 376 key->key[4], key->key[5], key->key[6], key->key[7], 377 key->key[8], key->key[9], key->key[10], key->key[11], 378 key->key[12], key->key[13], key->key[14], key->key[15]); 379 380 if (write(f, buf, strlen(buf)) < 0) { 381 syslog(LOG_ERR, "Could not write temp keys file. " \ 382 "%s (%d)\n", strerror(errno), errno); 383 break; 384 } 385 } 386 387 close(f); 388 389 if (rename(tmp, HCSECD_KEYSFILE) < 0) { 390 syslog(LOG_ERR, "Could not rename(%s, %s). %s (%d)\n", 391 tmp, HCSECD_KEYSFILE, strerror(errno), errno); 392 unlink(tmp); 393 return (-1); 394 } 395 396 return (0); 397} 398 399/* Free key entry */ 400static void 401free_key(link_key_p key) 402{ 403 if (key->name != NULL) 404 free(key->name); 405 if (key->key != NULL) 406 free(key->key); 407 if (key->pin != NULL) 408 free(key->pin); 409 410 memset(key, 0, sizeof(*key)); 411 free(key); 412} 413 414/* Convert hex ASCII to int4 */ 415static int 416hexa2int4(char *a) 417{ 418 if ('0' <= *a && *a <= '9') 419 return (*a - '0'); 420 421 if ('A' <= *a && *a <= 'F') 422 return (*a - 'A' + 0xa); 423 424 if ('a' <= *a && *a <= 'f') 425 return (*a - 'a' + 0xa); 426 427 syslog(LOG_ERR, "Invalid hex character: '%c' (%#x)", *a, *a); 428 exit(1); 429} 430 431/* Convert hex ASCII to int8 */ 432static int 433hexa2int8(char *a) 434{ 435 return ((hexa2int4(a) << 4) | hexa2int4(a + 1)); 436} 437 438